Eclipse 12" Adjustable Basin Wrench

Amazon

250 mm / 10 inch range Forged carbon steel head for strength and durabilIty Swivel, adjustable head for easy tightening and removal of faucet and filler valve nuts Spring loaded jaws adjust to size of nuts Chrome plated for rust resistance T-bar handle for easy operation

Zoro Tools

A specialised tool used in the installation or removal of kitchen and bathroom sink faucets. It has a long shaft designed to reach into the tight space underneath the sink to loosen or tighten the mounting nuts which can be hard to reach with other wrenches or pliers